Pneumatic separator.



No. 687,266. v Patqnted Nov. 26, 190|.

A. RAYMOND. I-"NEllloIATlCv SEPARATGR.

K (Application filed Oct. 9, 1899,) (No Model.)

2 Sheets-Shed l.

W/TNESSES.'

No. 687,266. Patented' Nov. 26,19m.

l A. RAYMOND. PNEUMATIC SEPARATDR.

(Application led Oct. 9, 1899.)

12Sheets-Shee 2.

(No Mo'del.)

n1: Humps FErERs co., mow-uwe.. WASHINGTON. u. n:4

. Nrrsn SrlrrnsA PATENT OFFICE.

ALBERT RAYMOND, OF CHICAGO, ILLINOIS.

PN EU NIATlC-SEPARATOR.

SEECIFICATION forming part of Letters Patent N o. 687,266, dated November 26, 1901. l Application filed October 9,1899. Serial No. 733,004. (No model.)

vof an air-current acts against gravity; and

my invention relates particularly to a separator of this class for which Letters Patent were granted to myself and George Raymond April 6, 1897, bearing No. 580,145. In this patent it is shown that the diminishingforce of an air-current is produced by placing one inverted hollow cone within another, leaving a space between them, whereby the intensity of an induced upward current of air between' them is diminished in proportion to the taper of the cones and the consequent increase of space the air will occupy as it is drawn up between the cones. As the mixed materialthat is, the ner and coarser particles of the pulverized substancesware carried by the induced current of air up between the said cones the coarser particles, because of their greater specific gravity, immediately begin to fall back and the finer particles pass on and are drawn off, so that before the material reaches the top of the cones the air-current becomes so diminished that all the coarser material will have fallen back into thepulverizer and only that of sufficient iineness will have passed over and out of the separator. l

Having thus stated the general operation of the patent above alluded to, it will make more apparent the object of my present improvement, which is to render more effective my former device, which I accomplish by the mechanism illustrated in the accompanying drawings, in which-- Figure 1 is an'elevation representing the separator above mentionedand my present improvement added; Fig. 2, a View looking downward, showing my improvement and a partial view of the separator alluded to, and Fig. 3 a plan view of my improvement.

1 is the outer cone-shaped shell; 2, the inner cone-shaped shell; 3, the space betweenv the said shells; 4, the cover of the conic shells, from which extends a conical deliector 5, extending slightly below the top of the outer cone and which may be made adjustable.

6 is a suction-pipe with a flared opening 6a at the top; 7, a fan-blower that creates the suction' and induced current of air which draws the finished product from the separator and discharges it into. the dust-collector 8, which may be of the cyclone, centrifugal, or any other type. The air in the dust-collector as it becomes free of the product is again returned to the separator through the pipe 10, and the finished product falls out of the bottom of the collector througha trap-discharge 9.

12 is a stack or throat into which is fed the material to be separated through the feedingpipe 11, thefeeder 11a being worked by the belt 11b. The tailings of the separator fall from the stack 12 through the spout 13 back into the pulverizer, which is not shown.

14 and 11ia represent floors of the building in which the separator is installed.

The separator as far asabove described is covered by the Patent No. 580,145, heretofore mentioned, and I will now point out and describe my present improvements.

15 and 15*L represent horizontal fan-wheels, the blades a of which stand at an angle with the horizontal plane. These fan-wheels are mounted at suitable distance apart, within the throat of the separator, on the shaft 16, which said shaft is actuated at high speed by any suitable means. By the rapid rotation of these fan-wheels certain useful results are attained-first, they thoroughly agitato, divide,and scatter the material within the s'tack l2; second, they throw the materialv upward mechanically and by an upward current of air they create, and, third, they cause the in= duced ascending current of air between the outer and inner cones of the separator to take a spiral motion, as indicated by arrows in Fig. 1, which causes the material to travel a greater distance before it reaches the mouth of the pipe leading to the dust-collector than if it ascended directly upward between the conic shells, thereby aording an increase of time for gravity to act upon the coarser particles before they ascend to the top of the said IOO shells,which prevents them from passing over with the finer portion. To further increase this whirling or spiral movement of the ascending current of air and the material it carries with it in the space inclosed between the inverted-cone-shaped shells, I provide a tangential inlet to the throat of the separator, through which passes into the said throatthe return air-current from the dust-collector. (Bestshown in Fig. 3.) This tangential inlet into the throat l2 of the separator, together with the action of the horizontal fan-blowers 15 and l5, as above explained, create such a powerful spiral action of the air-current and material to be acted upon that in practice I find it makes the same separator far more eflicient.

Having described my improvement and explained its operation, what I claim as new and useful, and desire to secure by Letters Patent, isy l. In a pneumatic separator the combination of a tangential inlet in the throat thereof and horizontal fan-blowers in the said throat having blades set at an angle with the h0rizontal plane, means for feeding material upon the upper surface of said fan and any suitable means for rapidly rotating` said blowers, whereby the material fed to said fans is agitated, separated and thrown upward into the separator by said fans, substantially as and for the purpose set forth.

2. In the throat of a pneumatic separator,

having two inverted-cone-shaped shells placed one within the other inclosing an air-passage between them, the combination of a tangential inlet and horizontal fan-blowers having blades set at an angle with the horizontal plane and having anyordinary means of rapid rotation, and means for feeding the material to be separated directly to said fan-wheels, substantially as described.

3. In a pneumatic separatolghaving two inverted-cone-shaped shells placed one within the other inclosing` an air-passage between them,the combination with the throat thereof ALBERT RAYMOND.

Witnesses:

HANS Il. KELLERMANN, F. R. JoHNsoN. 

